Choose a Damper: How to Find the Right One

[yerzhikus]

Lets assume a simple situation where there is a spring and a damper connected in parallel.
We place some weight above them and begin the vibrations.
The equation will then be:

Mx'' = -kx -cx' -Mg
So, I want to find a damper with a certain coeffitient c.
I mean, that I want to find a real damper, that will fit that equation with the c parameter.
I just fix a value of c = const, which satisfies me, and the I want to test my system with a real damper. The problem is that I can't find the needed specification in all specifications of dampers I've looked at, I want to see something like this:
The linear damper has the parameter c = some constant. Or something like that.
Instead of it I see many other parameter. Can anybody help me to find out how to resolve my problem? Or I also would like, if possible to get the damper force F from that specifications, but I can;t see it also. In the equation the damper force will be F = -cx'

 

[kuruman]

Sorry, you have to be more specific.

... I want to see something like this:

... Or something like that.

... Instead of it I see many other parameter.

All of the above are too vague for us to understand what your problem is and how we can help you with it.